Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Before trying anything else, pull the power for 30 seconds and then boot it back up. If that doesn't help, then try removing Hulu (just do one at a time). Highlight the Hulu tile on the home screen, press the * button, and select remove. After that, reboot the Roku. Either pull the power again or use the Settings/System/System restart menu. After it boots, then add the channel back and see if it works.
What model Roku do you have (model number, not name)?
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.